A study was made of the length of dry and wet spells at five Canadian cities. From the results of the study it was learned that after a wet day the probability of the following day being wet is constant no matter how long the wet period has persisted; the same is true for the weather following a dry day except that there is a slight increase in the probability of dry weather with increasing length of the dry period. As a corollary to the study, the probability of the weather following either a wet or dry day was determined for each month for each of the five cities. Also a simpler method is suggested for determining approximations to these figures.
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Richmond W. Longley (1953) studied this question.